Xcode 3.0 crashes on project load

Whenever I open any project in Xcode, it freezes and I have to force quit. Leopard is up to date, I have no extensions/templates/etc installed, and I reinstalled Xcode once. Even the examples don't work. I did try deleting the preferences.

Any ideas? I searched the mailing lists and came up with no solutions that I hadn't already tried.

Xcode 3.0 hangs for up to about 5 minutes on some project openings. I'm not sure if that's a 64-bit thing (in which case ticking the "open in 32-bit mode" in the Finder may help) or whether it's a more-than-two processors thing. Your MBP specs suggest the former.

Of course, you could have found a hang which doesn't end, in which case filing a bug report and recreating your project from scratch (or using a sane build system) is probably in order.

Have you tried repairing permissions? Xcode might be waiting for something that doesn't have permission to launch. You could also watch the Activity Monitor as you open a project - you might see something pop up there to give you a clue.
Does this happen when you create a new project too? I imagine it would but you never know.

Try disabling distributed builds in your XCode preferences. Open the relevant preference pane and make sure that all the check boxes are not checked (including the 'Bonjour' checkbox. This fixed the problem for me in XCode 3.0.